<template>
  <div>
    <div class="shopcart">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight': totalCount > 0}">
              <i class="icon-shopping_cart" :class="{'highlight': totalCount > 0}"></i>
            </div>
            <div class="num" v-show="totalCount > 0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight': totalPrice > 0}">{{totalPrice}}元</div>
          <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop="pay">
          <div class="pay" :class="{'enough': totalPrice >= minPrice}">{{payDesc}}</div>
        </div>
      </div>
      <div class="ball-container">
        <transition-group name="drop" @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
          <div v-for="(ball, index) in balls" :key="index" v-show="ball.show" class="ball">
            <div class="inner inner-hook"></div>
          </div>
        </transition-group>
      </div>
      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectFoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price * food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <v-cartcontrol :food="food" @add-cart="drop"></v-cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="fade">
      <div class="list-mask" v-show="listShow" @click="fold = true"></div>
    </transition>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  export default {
    components: {'v-cartcontrol': cartcontrol},
    props: {
      selectFoods: {
        type: Array,
        default () {
          return [];
        }
      },
      deliveryPrice: {type: Number, default: 0},
      minPrice: {type: Number, default: 0}
    },
    data () {
      return {
        balls: [
          {show: false},
          {show: false},
          {show: false},
          {show: false},
          {show: false}
        ],
        dropBalls: [],
        fold: true
      };
    },
    computed: {
      listShow () {
        if (!this.selectFoods.length) {
          this.fold = true;
          return false;
        }
        let show = !this.fold;
        if (show) {
          this.$nextTick(() => {
            if (!this.scroll) {
              this.scroll = new BScroll(this.$refs.listContent, {click: true});
            } else this.scroll.refresh();
          });
        }
        return show;
      },
      totalPrice () {
        let total = 0;
        this.selectFoods.forEach((food) => {
          total += food.price * food.count;
        });
        return total;
      },
      totalCount () {
        let count = 0;
        this.selectFoods.forEach((food) => {
          count += food.count;
        });
        return count;
      },
      payDesc () {
        if (this.totalPrice === 0) return `￥${this.minPrice}起送`;
        if (this.totalPrice < this.minPrice) return `还差￥${this.minPrice - this.totalPrice}元起送`;
        return '去结算';
      }
    },
    methods: {
      pay () {
        let totalPrice = this.totalPrice;
        if (totalPrice < this.minPrice) return;
        window.alert(`去支付${totalPrice}元`);
      },
      empty () {
        this.selectFoods.forEach((food) => {
          food.count = 0;
        });
      },
      toggleList () {
        if (this.selectFoods.length === 0) {
          return;
        }
        this.fold = !this.fold;
      },
      drop (el) {
        for (let ball of this.balls) {
          if (!ball.show) {
            ball.show = true;
            ball.el = el;
            this.dropBalls.push(ball);
            return;
          }
        }
      },
      beforeEnter (el) {
        let count = this.balls.length;
        while (count--) {
          let ball = this.balls[count];
          if (ball.show) {
            let rect = ball.el.getBoundingClientRect();
            let x = rect.left - 32 - 8 + 18;
            let y = -(window.innerHeight - rect.top - 22 - 8 - 16);
            el.style.display = '';
            el.style.webkitTransform = `translate3d(0, ${y}px, 0)`;
            el.style.transform = `translate3d(0, ${y}px, 0)`;
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = `translate3d(${x}px, 0, 0)`;
            inner.style.transform = `translate3d(${x}px, 0, 0)`;
          }
        }
      },
      enter (el) {
        /* eslint-disable no-unused-vars */
        let rf = el.offsetHeight;
        this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0, 0, 0)';
          el.style.transform = 'translate3d(0, 0, 0)';
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3d(0, 0, 0)';
          inner.style.transform = 'translate3d(0, 0, 0)';
        });
      },
      afterEnter (el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      }
    }
  };
</script>

<style type="text/stylus" lang="stylus">
  @import "../../common/stylus/mixin.styl"
  .shopcart
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: 100%;
    height: 48px;
    background-color: #000;
    .content
      display: flex;
      background-color: #141d27;
      font-size: 0;
      color: rgba(255, 255, 255, .4);
      .content-left
        flex: 1;
        .logo-wrapper
          display: inline-block;
          vertical-align: top;
          position: relative;
          top: -10px;
          margin: 0 12px;
          padding: 6px;
          width: 56px;
          height: 56px;
          box-sizing: border-box;
          border-radius: 50%;
          background-color: #141d27;
          .logo
            width: 100%;
            heigth: 100%;
            border-radius: 50%;
            text-align: center;
            background-color: #2b343c;
            &.highlight
              background-color: rgb(0, 160, 220);
            .icon-shopping_cart
              line-height: 44px;
              font-size: 24px;
              color: #80858a;
              &.highlight
                color: #fff;
          .num
            position: absolute;
            top: 0;
            right: 0;
            width: 24px;
            height: 16px;
            line-height: 16px;
            text-align: center;
            border-radius: 16px;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            background-color: rgb(240, 20, 20);
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, .4);
        .price
          display: inline-block;
          vertical-align: top;
          margin-top: 12px;
          line-height: 24px;
          padding-right: 12px;
          box-sizing: border-box;
          border-right: 1px solid rgba(255, 255, 255, .1);
          font-size: 16px;
          font-weight: 700;
          &.highlight
            color: #fff;
        .desc
          display: inline-block;
          vertical-align: top;
          margin: 12px 0 0 12px;
          line-height: 24px;
          font-size: 10px;
      .content-right
        flex: 0 0 105px;
        width: 105px;
        .pay
          height: 48px;
          line-height: 48px;
          text-align: center;
          font-size: 12px;
          font-weight: 700;
          background-color: #2b333b;
          &.enough
            background-color: #00b43c;
            color: #fff;
    .ball-container
      .ball
        position: fixed;
        left: 32px;
        bottom: 22px;
        z-index: 200;
        &.drop-enter-active, &.drop-leave-active
          transition: all .4s cubic-bezier(.49, -.29, .75, .41);
        .inner
          width: 16px;
          height: 16px;
          border-radius: 50%;
          background-color: rgb(0, 160, 220);
          transition: all .4s linear;
    .shopcart-list
      position absolute
      top 0
      left 0
      z-index -1
      width 100%
      transform translate3d(0, -100%, 0)
      &.fold-enter-active, &.fold-leave-active
        transition all .5s
      &.fold-enter, &.fold-leave-active
        transform translate3d(0, 0, 0)
      .list-header
        height 40px
        line-height 40px
        padding 0 18px
        background-color #f3f5f7
        border-bottom 1px solid rgba(7, 17, 27, .1)
        .title
          float left
          font-size 14px
          color rgb(7, 17, 27)
        .empty
          float right
          font-size 12px
          color rgb(0, 160, 220)
      .list-content
        padding 0 18px
        max-height 217px
        overflow hidden
        background-color #fff
        .food
          position relative
          padding 12px 0
          box-sizing border-box
          border-1px(rgba(7, 17, 27, .1))
          .name
            line-height 14px
            font-size 14px
            color rgb(7, 17, 27)
          .price
            position absolute
            right 90px
            bottom 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240, 20, 20)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 6px
  .list-mask
    position fixed
    top 0
    left 0
    width 100%
    height 100%
    z-index 40
    opacity 1
    background-color rgba(7, 17, 27, .6)
    backdrop-filter blur(10px)
    &.fade-enter-active, &.fade-leave-active
      transition all .3s
    &.fade-enter, &.fade-leave-active
      opacity 0
      backdrop-filter blur(0px)
  .xxx
    xxx xxx
</style>
